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Enhanced Magnetic Moment of Epitaxial Υ´-Fe<sub>4</sub>N Films at Low Temperature
Shahid Atiq,Murtaza Saleem,Shahid M. Ramay,Saadat A. Siddiqi,M. Sabieh Anwar,신성철 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Ferromagnetic iron nitride has fascinated the researchers owing to its amazing magnetic properties for spintronic applications. We have prepared single phase epitaxial thin films of Υ´-Fe<sub>4</sub>N on single crystal MgO(100) substrates using dc magnetron sputtering. X-ray diffraction revealed that substrate temperature and annealing time were most important parameters for single phase epitaxial growth of the films. Atomic force microscopy and scanning electron microscopy were utilized to investigate the surface morphology of the films. Angle dependent magnetic anisotropy was observed in epitaxial thin films of Υ´-Fe<sub>4</sub>N. A superconducting interference device was utilized to explore the magnetic and electrical behavior of Υ´-Fe<sub>4</sub>N films at low temperatures.
Shahid Ali,Manzar Sohail,Riaz Ahmed,Safyan Akram Khan,Muhammad Shahid Ansari 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Co@Pt (Co-core, Pt-shell) 4–10 nm sized particles supported on functionalized multi-walled carbonnanotubes (MWCNTs) have been synthesized and tested as efficient catalyst in direct methanol fuel cells(DMFCs). Catalytic activity and durability of all the catalysts for methanol oxidation (MO) have beenstudied in basic medium (0.5 M KOH) using cyclic voltammetry (CV). Chronoamperometry studiesrevealed that Co@Pt/MWCNTs has significantly high efficiency and stability than both Pt/MWCNTs andCo@Pt/MWCNTs catalysts. Mass activity exhibited by Co@Pt/MWCNTs for MO is 1.61 and 3.36 timeshigher than those of Pt–Co/MWCNTs and Pt/MWCNTs, respectively.
Antioxidant Properties of Methanolic Extracts from Leaves of Rhazya stricta
Shahid Iqbal,M.I. Bhanger,Mubeena Akhtar,Farooq Anwar,Khawaja Raees Ahmed,Tabraz Anwer 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.2
Because of increased safety concerns about synthetic antioxidants, exploitation of cheaper and safer sourcesof antioxidants based on natural origin is the focus of research nowadays. Rhazya stricta is a medicinally important plant na-tive to South Asia. Extraction of antioxidants was carried out in different solvent systems, i.e., water, 80% methanol, 70%ethanol, and diethyl ether. The methanolic extract exhibited the highest total phenolic content among the extracts; thereforefor further studies the methanolic extract was employed. Antioxidant activity measurement in the linoleic acid system, metalchelating activity, reducing power, scavenging effect on 1,1-diphenyl-2-picrylhydrazyl free radical, and superoxide anion rad-ical scavenging activity were taken as the parameters for assessment of antioxidant potential of methanolic extracts. Resultswere compared with .-tocopherol and the synthetic antioxidant butylated hydroxyanisole. The antioxidant potential of methano-lic extracts of R. strictaleaves was comparable with previously exploited potent antioxidants and is strongly concentrationdependent.
Static and Dynamic Magnetic Domains of Epitaxial 0-Fe4N Thin Films
Shahid Atiq,Saadat Anwar Siddiqi,고현석,신성철 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
Highly-ordered single-phase thin films of r'-Fe4N were deposited by dc magnetron sputtering directly on single-crystal MgO(100) substrates at different temperatures. The surface morphology showed that a very regular nano-sized grain structure gradually turned into a smooth layered growth with increasing temperature up to 450 ˚C. The minimum root-mean-square value of the surface roughness was achieved after 30 minutes in-situ annealing at 450 ˚C. The epitaxial texture of the films was revealed by X-ray diffractometry Bi-axial in-plane magnetic anisotropy, characteristic of strong ferromagnetism, was observed from the quite squarish M-H loops obtained with the help of a vibrating sample magnetometer Bow-tieshaped static domain patterns and a very dense domain structure were direct evidence of strong exchange coupling among magnetic domains. Time-resolved dynamic magnetic domain patterns were observed in r'-Fe4N thin films by using a magneto-optic microscope magnetometer. Highly-ordered single-phase thin films of r'-Fe4N were deposited by dc magnetron sputtering directly on single-crystal MgO(100) substrates at different temperatures. The surface morphology showed that a very regular nano-sized grain structure gradually turned into a smooth layered growth with increasing temperature up to 450 ˚C. The minimum root-mean-square value of the surface roughness was achieved after 30 minutes in-situ annealing at 450 ˚C. The epitaxial texture of the films was revealed by X-ray diffractometry Bi-axial in-plane magnetic anisotropy, characteristic of strong ferromagnetism, was observed from the quite squarish M-H loops obtained with the help of a vibrating sample magnetometer Bow-tieshaped static domain patterns and a very dense domain structure were direct evidence of strong exchange coupling among magnetic domains. Time-resolved dynamic magnetic domain patterns were observed in r'-Fe4N thin films by using a magneto-optic microscope magnetometer.
RAPID THERMAL LOAD ESTIMATION USING A SET OF SMART GRAPHS
SHAHID ALI KHAN,JOSEPH ANTHONY MENICUCCI JR,SARIM NAJI AL-ZUBAIDY 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.1
The purpose of this research was to develop simple thermal load smart graphs for rapid thermal load estimation. These graphs were generated in order to facilitate a quick estimation of the thermal load. This is especially important when computer-aided heating, ventilation and airconditioning (HVAC) design software is unavailable. Hundreds of calculations have been carried out using various heat transfer equations and an hourly analysis program (HAP) generated graphs displaying the external and internal sensible and latent heat gains of analyzed spaces. These smart graphs are very user friendly; non-technical individuals can easily calculate the thermal load using these graphs. The smart graphs are time-saving and give results more accurate than thumb rules. In fact, they give a total thermal load estimate that is less than few percent di®erent from the estimate generated using commercial software programs.
Short Communication Antinociceptive activity of Avicennia officinalis
Shahid, IZ,Karmakar, D,Sadhu, SK,Ahmed, F Kyung Hee Oriental Medicine Research Center 2007 Oriental pharmacy and experimental medicine Vol.7 No.1
The crude ethanol extract of leaves of Avicennia officinalis Linn. (Family: Avicenniaceae) was screened for its antinociceptive activity. The extract produced significant writhing inhibition in acetic acid-induced writhing in mice at the oral dose of 250 and 500 mg/kg body weight (P < 0.001) comparable to the standard drug diclofenac sodium at the dose of 25 mg/kg of body weight. The result tends to suggest the antinociceptive activity of the extract.